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Build arm32v7 and arm64v8 failed

I have 3 builds in my repository.
The base is the debian:buster-slim package.

The build is working perfectly so far.

Now I want to integrate a new feature and have added the following additional build instructions:

### StefaE/PVForecast (Solcast)
RUN apt update \
&& apt install --no-install-recommends -y python3-pip  python3.7-dev python3-setuptools python3-wheel libhdf5-dev netcdf-bin libnetcdf-dev \
&& pip3 install --no-cache-dir --no-warn-script-location cython pysolcast astral influxdb pandas siphon tables elementpath beautifulsoup4 h5py netcdf4 pvlib

The amd64 continues to run through without any problems. The arm32v7 and arm64v8 ones do not.
They run for about 220 minutes and then abort.

These are the last lines of the log:

RuntimeError: Running cythonize failed!
[91mCommand "python egg_info" failed with error code 1 in /tmp/pip-install-ho33zto9/numexpr/

Does anyone have any idea what this is and how I can fix it?